/*
* MBackTop
*/
.M-back-top{
  text-align: center;
  position: fixed;
  right: 50px;
  z-index: 1000;
  bottom: 150px;
  background: rgba(151,151,151,.8);
  display: inline-block;
  padding: 5px;
  border-radius: 50%;
  width: 34px;
  height: 34px;
  line-height: 1.5;
  cursor: pointer;
  transition:all .2s cubic-bezier(.645,.045,.355,1);
  visibility: hidden;
}
.M-back-top:hover{
  opacity: 0.7;
}
.M-in-top{
  visibility: visible;
}
.M-icon{
  display: inline-block;
  font-style: normal;
  vertical-align: baseline;
  text-align: center;
  text-transform: none;
  text-rendering: auto;
  line-height: 1;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}